Original Member, Ambassador: OneWorld Alliance
Join Date: May 1998
Location: Austin, TX, USA
Programs: AA ExecPlat & 3MM; Marriott Titanium
Posts: 1,015
If the flight is not full and you don't have anything to check in, then you should try going "stand by".
Otherwise, you will have to pay the difference in fare (if you are lucky, you might be able to get them to wave the $100 change fee).
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Sagy